Failed to load resource: the server responded with a status of 500 (URL Rewrite Module Error.)

My setup: Windows 2012 R2 IIS 8.5

When i update the site to 8.1.7 it breaks the site with the fallowing error many times on the browser console and the theme is all messed up:

Failed to load resource: the server responded with a status of 500 (URL Rewrite Module Error.)

If i copy the old web.config back to the site it works fine, if i manually add the new lines to the web.config the same thing happens.

This is the new lines causing the problem:

      <rule name="Erase HTTP_PROXY" patternSyntax="Wildcard">
          <match url="*.*" />
          <serverVariables>
            <set name="HTTP_PROXY" value="" />
          </serverVariables>
          <action type="None" />
        </rule>

Update:I did not notice the match url line above had to match my current web address after changing that the site is back to normal.